Fix cinder quota cleanup

The cinder quota update test is setting default quotas for volume types
that might have been removed while we were running tests. Only update
the default quotas for the global values.

https://review.openstack.org/#/c/81503 fixed the test comparison which
was also broken, now the race condition hits in the cleanup.

Change-Id: I496e699e3b805aa2130ed39476008a6cd2b0cb6d
Closes-Bug: 1294824
Merge "Fix cinder quota cleanup"